Resolve #3445095 "Responsive image test 5.x"

Closes #3445095

tests/src/Functional/ResponsiveImageFieldDisplayTest.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\cdn\Functional;
+
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\File\FileUrlGeneratorInterface;
+use Drupal\Tests\responsive_image\Functional\ResponsiveImageFieldDisplayTest as CoreTest;
+use Drupal\Tests\UiHelperTrait;
+
+/**
+ * @group cdn
+ */
+class ResponsiveImageFieldDisplayTest extends CoreTest {
+
+  use UiHelperTrait {
+    buildUrl as coreBuildUrlWithBrokenSchemeLessUrlSupport;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['cdn'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    // Configure CDN integration.
+    $this->config('cdn.settings')
+      ->set('mapping', [
+        'type' => 'simple',
+        // Specify a host that resolves in the test environment.
+        'domain' => parse_url($GLOBALS['base_url'], PHP_URL_HOST),
+        'conditions' => [],
+      ])
+      ->set('status', TRUE)
+      // Disable the farfuture functionality: simpler file URL assertions.
+      ->set('farfuture', ['status' => FALSE])
+      ->save();
+
+    // Rebuild the container to ensure the reconstructed `CdnSettings` service
+    // is used by the CDN module's file URL generator decorator service.
+    $this->rebuildContainer();
+    $this->fileUrlGenerator = $this->container->get(FileUrlGeneratorInterface::class);
+
+    // TRICKY: necessary to avoid triggering an exception in ThemeManager.
+    // @see \Drupal\Core\Theme\ThemeManager::render()
+    $this->container->get(ModuleHandlerInterface::class)->reload();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function buildUrl($path, array $options = []) {
+    // @todo Remove this when \Drupal\Tests\UiHelperTrait::buildUrl() is fixed.
+    // Support scheme-relative URLs.
+    if (is_string($path) && str_starts_with($path, '//')) {
+      return $path;
+    }
+
+    return $this->coreBuildUrlWithBrokenSchemeLessUrlSupport($path, $options);
+  }
+
+}